I used this type Awning Track[FONT=Tahoma,arial]
(A52-1276)[/FONT] and Welt [FONT=Tahoma,arial]
(V15-0034BKA)[/FONT]
http://www.morseindustries.com/products.cfm?productkey=1035&productgroupkey=10&categoryid=3
The track is aluminum and I pop riveted it (every 6") onto the Extreme's upper half shell. Track is 6' long and mounted just above the lip that runs the length on each side. The pop rivets do not protrude inside the tent sleeping/finished area. They are 3/8" long and protrude inside the area between where the fabric walls attach at the top and the lower lip of the top. There is no change of leaking into the sleeping area because they didn't violate it. The rivets are backed with washers to disperse the stress. A bead of Plumber's Goop between the track and tent made a water tight seal. I also have no conflicts or buzzing bits when shutting the tent either. I lamented for years over this and have no regrets now that I've done it. Things worked out first rate.
The Sunbrella material is sewn to the welt and it slides into the track just like a sail.
I support the awning with poles that go back to the roof rack. I didn't want any stakes or ropes running down to the ground. Instead they run back to the wheel wells of the vehicle. This way if the wind blows and the car rocks the awnings stay fixed with the car and don't pull against immobile objects. I have tried it out in a good breeze and it looks like it works quite fine. So far I have only made things out of PVC but that is going to change to aluminum tubing in the final version. I may use marine deck hinges and similar hardware for the stationary points.
I will get the camera out and take some pics of the prototype setup.
I have also put a marine electrical feed through plug on the tents lower rear. Inside I made a breakout box that I can plug in 12 devices (fans, lights, radios). I can either plug it into the car or where there's 110vac I use a 1 amp 12v power supply. I replaced the tents light with an LED unit and the fan I have is ultra low power. It all seems to work quite well.
Chow,
Jon